Commit 1dfeb768 authored by alex chen's avatar alex chen Committed by Linus Torvalds
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ocfs2: add a mount option journal_async_commit on ocfs2 filesystem 



Add a mount option to support JBD2 feature:

JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT.  When this feature is opened, journal
commit block can be written to disk without waiting for descriptor blocks,
which can improve journal commit performance.  This option will enable
'journal_checksum' internally.

Using the fs_mark benchmark, using journal_async_commit shows a 50%
improvement, the files per second go up from 215.2 to 317.5.

test script:
fs_mark  -d  /mnt/ocfs2/  -s  10240  -n  1000

default:
FSUse%        Count         Size    Files/sec     App Overhead
     0         1000        10240        215.2            17878

with journal_async_commit option:
FSUse%        Count         Size    Files/sec     App Overhead
     0         1000        10240        317.5            17881

Signed-off-by: default avatarAlex Chen <alex.chen@huawei.com>
Signed-off-by: default avatarWeiwei Wang <wangww631@huawei.comm>
Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
Reviewed-by: default avatarMark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 15eba0fe

Documentation/filesystems/ocfs2.txt

+4 −0
Original line number Diff line number Diff line
@@ -100,3 +100,7 @@ coherency=full (*) Disallow concurrent O_DIRECT writes, cluster inode 
coherency=buffered	Allow concurrent O_DIRECT writes without EX lock among

			nodes, which gains high performance at risk of getting

			stale data on other nodes.

journal_async_commit	Commit block can be written to disk without waiting

			for descriptor blocks. If enabled older kernels cannot

			mount the device. This will enable 'journal_checksum'

			internally.

fs/ocfs2/ocfs2.h

+2 −0
Original line number Diff line number Diff line
@@ -279,6 +279,8 @@ enum ocfs2_mount_options 
						     writes */

	OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */

	OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */



	OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15,  /* Journal Async Commit */

};



#define OCFS2_OSB_SOFT_RO	0x0001

fs/ocfs2/super.c

+17 −0
Original line number Diff line number Diff line
@@ -191,6 +191,7 @@ enum { 
	Opt_coherency_full,

	Opt_resv_level,

	Opt_dir_resv_level,

	Opt_journal_async_commit,

	Opt_err,

};
@@ -222,6 +223,7 @@ static const match_table_t tokens = { 
	{Opt_coherency_full, "coherency=full"},

	{Opt_resv_level, "resv_level=%u"},

	{Opt_dir_resv_level, "dir_resv_level=%u"},

	{Opt_journal_async_commit, "journal_async_commit"},

	{Opt_err, NULL}

};
@@ -1500,6 +1502,9 @@ static int ocfs2_parse_options(struct super_block *sb, 
			    option < OCFS2_MAX_RESV_LEVEL)

				mopt->dir_resv_level = option;

			break;

		case Opt_journal_async_commit:

			mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;

			break;

		default:

			mlog(ML_ERROR,

			     "Unrecognized mount option \"%s\" "
@@ -1606,6 +1611,9 @@ static int ocfs2_show_options(struct seq_file *s, struct dentry *root) 
	if (osb->osb_dir_resv_level != osb->osb_resv_level)

		seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);



	if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)

		seq_printf(s, ",journal_async_commit");



	return 0;

}
@@ -2475,6 +2483,15 @@ static int ocfs2_check_volume(struct ocfs2_super *osb) 
		goto finally;

	}



	if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)

		jbd2_journal_set_features(osb->journal->j_journal,

				JBD2_FEATURE_COMPAT_CHECKSUM, 0,

				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);

	else

		jbd2_journal_clear_features(osb->journal->j_journal,

				JBD2_FEATURE_COMPAT_CHECKSUM, 0,

				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);



	if (dirty) {

		/* recover my local alloc if we didn't unmount cleanly. */

		status = ocfs2_begin_local_alloc_recovery(osb,

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